FIELD: chemistry.
SUBSTANCE: invention relates to a method for synthesis of light olefins in form of ethylene and propylene, which is characterised by the following steps: a) bringing starting material which contains 65-100 wt % methanolin the methanol conversion zone of the reactor with a methanol conversion catalyst and under reaction conditions at temperature between 200°C and 300°C, pressure between 200 and 1500 kPa and mass hourly average supply rate between 2 and 15 hour-1, in order to obtain a stream of methanol from the conversion zone of the reactor containing dimethyl ether and water; b) removal of at least a portion of water from the stream of methanol from the methanol conversion zone of the reactor with formation of a first process stream containing dimethyl ether and has low water content, and a second process stream which contains methanol and has high water content compared to the said first process stream; c) directing a portion of or the entire second process stream to a washing column; d) bringing material containing at least a portion of the first process stream in the oxygen-containing compound conversion zone of the reactor with an oxygen-containing compound conversion catalyst under reaction conditions for conversion of oxygen-containing compounds at temperature between 200°C and 700°C and at absolute reaction pressure between 240 and 580 kPa in order to convert at least a portion of the said material to a stream of products of conversion of oxygen-containing compounds which contain light and heavy olefins; and e) directing the stream of products of conversion of oxygen-containing compounds to the washing column in which the second process stream washes the stream of products of conversion of oxygen-containing compounds in order to obtain a washed stream of olefins for further use in the reaction, and a stream of wastes which contains oxygen-containing compounds and water. The invention also relates to a device for realising the said method.
EFFECT: use of the said invention simplifies production of light olefins from oxygen-containing material.
14 cl, 2 dwg
